Presentation Details
| Revolutionary copper metallization technology for terawatt PV industry Tian He, Peng Li Li, Xin Dong, Haoran Qiu, Jun Duan, Yunpeng Li, Hua Wu, Xiaoning Ru, Lan Chen, Junxiong Lu, Xixiang Xu, Zhenguo Li, Liang Fang Fang, Bo He. Central R&D Institute, LONGi Green Energy Technology Co., Ltd., Xi’an, China |
Abstract
Benefiting from high conductivity and low cost, copper metallization is considered the optimal approach, as it can directly replace silver paste without modifying existing processes or equipment. However, the susceptibility of copper to oxidation in air, coupled with its rapid diffusion and migration in silicon has long impeded the reliability and large-scale industrial application of copper metallization technology. Here, this work reports an air-stable copper paste using copper powder as the raw material, via copper powder passivation and organic phase pre-crosslinking processes. The application of this copper paste in screen-printed electrodes enables an impressive certified power conversion efficiency (PCE) of 27.40% for back-contact cells. Meanwhile, after the modules are subjected to the damp heat test (DH2000), thermal cycle test(TC600) and PID test (PID192), the power attenuation of the modules is ＜ 2.5 % in all cases. Notably, the copper metallization technical scheme reported in this work has been successfully implemented in production lines, marking the first-ever integration of copper paste technology into GW-scale production lines in the history of the PV industry.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.